Concrete mixing tool



FIG. 1 is a perspective view of a concrete mixing tool showing new design, wherein the bucket is provided for purposes of environment and forms no part of the claimed design;

FIG. 2 is an alternate perspective view thereof;

FIG. 3 is a partial side elevation view of the lower portion of the tool;

FIG. 4 is a front elevation view thereof; and,

FIG. 5 is a side elevation view thereof. 

CLAIM The ornamental design for a concrete mixing tool, as shown and described. 